/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with this library; if not, write to the Free

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_config.h"

/*

Note: This file hasn't been modified so technically we have to keep the disclaimer :-(

Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.

Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.

("Apple") in consideration of your agreement to the following terms, and your

use, installation, modification or redistribution of this Apple software

constitutes acceptance of these terms. If you do not agree with these terms,

please do not use, install, modify or redistribute this Apple software.

In consideration of your agreement to abide by the following terms, and subject

to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs

copyrights in this original Apple software (the "Apple Software"), to use,

reproduce, modify and redistribute the Apple Software, with or without

modifications, in source and/or binary forms; provided that if you redistribute

the Apple Software in its entirety and without modifications, you must retain

this notice and the following text and disclaimers in all such redistributions of

the Apple Software. Neither the name, trademarks, service marks or logos of

Apple Computer, Inc. may be used to endorse or promote products derived from the

Apple Software without specific prior written permission from Apple. Except as

expressly stated in this notice, no other rights or licenses, express or implied,

are granted by Apple herein, including but not limited to any patent rights that

may be infringed by your derivative works or by other works in which the Apple

Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO

WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

COMBINATION WITH YOUR PRODUCTS.

IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

/*=============================================================================

CAGuard.cp

=============================================================================*/

/*=============================================================================

Includes

=============================================================================*/

#include <stdlib.h>

#include <string.h>

*/

#define assert(X)

/*#warning Need a try-based Locker too*/

/*=============================================================================

SDLOSXCAGuard

=============================================================================*/

static int

SDLOSXCAGuard_Lock (SDLOSXCAGuard * cag)

if (pthread_self () != cag->mOwner) {

OSStatus theError = pthread_mutex_lock (&cag->mMutex);

(void) theError;

assert (theError == 0);

cag->mOwner = pthread_self ();

}

return theAnswer;

}

static void

SDLOSXCAGuard_Unlock (SDLOSXCAGuard * cag)

theError = pthread_mutex_unlock (&cag->mMutex);

(void) theError;

assert (theError == 0);

}

static int

SDLOSXCAGuard_Try (SDLOSXCAGuard * cag, int *outWasLocked)

int theAnswer = 0;

*outWasLocked = 0;

if (pthread_self () == cag->mOwner) {

theAnswer = 1;

*outWasLocked = 0;

theAnswer = 1;

*outWasLocked = 1;

}

}

return theAnswer;

}

static void

SDLOSXCAGuard_Wait (SDLOSXCAGuard * cag)

cag->mOwner = 0;

theError = pthread_cond_wait (&cag->mCondVar, &cag->mMutex);

(void) theError;

assert (theError == 0);

cag->mOwner = pthread_self ();

static void

SDLOSXCAGuard_Notify (SDLOSXCAGuard * cag)

OSStatus theError = pthread_cond_signal (&cag->mCondVar);

(void) theError;

assert (theError == 0);

}

SDLOSXCAGuard *

new_SDLOSXCAGuard (void)

SDLOSXCAGuard *cag =

(SDLOSXCAGuard *) SDL_malloc (sizeof (SDLOSXCAGuard));

if (cag == NULL)

return NULL;

SDL_memset (cag, '\0', sizeof (*cag));

#define SET_SDLOSXCAGUARD_METHOD(m) cag->m = SDLOSXCAGuard_##m

SET_SDLOSXCAGUARD_METHOD (Lock);

SET_SDLOSXCAGUARD_METHOD (Unlock);

SET_SDLOSXCAGUARD_METHOD (Try);

SET_SDLOSXCAGUARD_METHOD (Wait);

SET_SDLOSXCAGUARD_METHOD (Notify);

#undef SET_SDLOSXCAGUARD_METHOD

theError = pthread_mutex_init (&cag->mMutex, NULL);

(void) theError;

assert (theError == 0);

theError = pthread_cond_init (&cag->mCondVar, NULL);

(void) theError;

assert (theError == 0);

cag->mOwner = 0;

return cag;

void

delete_SDLOSXCAGuard (SDLOSXCAGuard * cag)

if (cag != NULL) {

pthread_mutex_destroy (&cag->mMutex);

pthread_cond_destroy (&cag->mCondVar);

SDL_free (cag);

}

}